Flying Vancouver-Hong Kong-Beijing-Urumqi-Almaty

I am a US citizen flying with a short layover in HK, then 30 hour layover in Beijing.
I have a hotel by the Great Wall with my welcome letter stating all the necessary info for my 72 hour transit visa application, However since i have a layover in HK and Urumqi (even though i do not plan to leave either airport) will that still enable me to get the free 72 hour Transit. I will be flying in and out of Beijing (PEK) Airport.

Thank you!